Caught in an apparent pissing match with Facebook, Farmville creators Zynga seems to be losing. Two weeks ago Zynga lost 3.1 million monthly active users. Last week they lost 4.2 million of them.

SecondShares reports that every one of Zynga's major games but Treasure Isle lost users last week.

The losses hit after Facebook revamped the way people receive Gift Requests and eliminated notifications. This essentially removed the ability for Zynga to advertise their games through faux in-game news alerts about how big your farm had grown or how powerful your Mafia family was.

And to make matters worse for Zynga, companies like Electronic Arts, 2K and Capcom are all starting to launch their own, better known brands in the realm of Facebook gaming.